20 Schematic Better | Lae801p Rev

| Parameter | Original Rev 20 | Improved Rev 20B | |-----------|----------------|------------------| | Output ripple (20MHz BW) | 210mV pk-pk | 38mV pk-pk | | Switching node overshoot | 28V | 16V | | Max load before thermal shutdown | 3.2A | 5.1A | | EMI (CISPR 22, 30-100MHz) | Fail | Pass with 6dB margin | | Efficiency at 4A | 81% | 89% |

| Method | Best For | |--------|----------| | Liebherr Service Portal (Partner access) | Official, vector, searchable PDF | | Liebherr Service Information System (LIS) | Revision-controlled drawings | | Contact Liebherr service support (with machine S/N) | Correct match to your exact board variant | lae801p rev 20 schematic better

⚠️ Many online "free" schematics for LAE801P are pre-Rev 20 or incomplete. Always check the revision block on the drawing. | Parameter | Original Rev 20 | Improved

| Ref | Original Part | Better Replacement | Notes | |-----|---------------|--------------------|-------| | CM1 | Not present | Bourns RN222-4-02 | Common mode choke | | Q1 | IRFZ44N | IRFB4110 | Lower Rds(on) | | D_boot | 1N4148 | STPS1L30U | Schottky, lower Vf | | C_comp | 1nF ceramic | 4.7nF C0G | Temperature stable | | R_gate | 100Ω | 22Ω + 1N4148 | See gate drive mod | | Method | Best For | |--------|----------| |

Is the LAE801P Rev 20 schematic worth fixing?
Yes – if you have existing boards or spares. The core topology is solid, but the original designer cut corners on EMI, gate drive, and compensation.

The “better” schematic provided above transforms a mediocre power board into a reliable, low-noise, efficient module suitable for sensitive loads (e.g., sensor arrays, precision motor drivers).

If you are evaluating or creating an improved version, ensure these sections are present: